Luke and Ethan had $800. Luke spent
35 of his money on a refrigerator. Ethan spent
15 of his money on a laptop. The refrigerator cost $120 more than the laptop. How much money had Luke left?
| |
Luke |
Ethan |
Total |
Before |
5 u |
+ 200 |
5x3 =
15 u |
800 |
Change |
- 3 u |
- 120 |
- 1x3 =
- 3 u |
|
Comparing the refrigerator
and the laptop |
120 more |
|
|
After |
2 u |
+ 80 |
4x3 =
12 u |
|
120 ÷ 3 = 40
2 x 40 = 80
5 x 40 = 200
Total amount that Luke and Ethan had at first
= 5 u + 200 + 15 u
= 20 u + 200
20 u + 200 = 800
20 u = 800 - 200
20 u = 600
1 u = 600 ÷ 20 = 30
Amount that Luke had left
= 2 u + 80
= 2 x 30 + 80
= 60 + 80
= $140
Answer(s): $140
